Supplementary Balance Sheet Information

3 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplementary Balance Sheet Information

8. Supplementary Balance Sheet Information

Inventories

The following is a summary of inventories at December 31, 2023 and September 30, 2023 (in thousands):

	December 31,		September 30,
	2023		2023
Raw materials and purchased parts	$	57,984	$	59,861
Work-in-process		12,460		11,400
Finished goods		56,740		56,937
Total inventories	$	127,184	$	128,198

Reserves related to write downs of inventory to net realizable value were $5.1 million and $5.0 million, respectively, at December 31, 2023 and September 30, 2023.

Warranty and Retrofit Costs

The following is a summary of product and warranty retrofit activity for the three months ended December 31, 2023 and 2022 (in thousands):

	Three Months Ended December 31,
	2023		2022
Balance at beginning of period	$	10,223	$	2,890
Adjustment for acquisitions		—		2,303
Accruals for warranties during the period		692		307
Costs incurred during the period		(868)		(321)
Balance at end of period	$	10,047	$	5,179